scholarly journals Soil Net Organic Nitrogen Mineralization Kinetics in Response to Short- and Long-term Land-use Conversion of Woodland to Tea Fields

2021 ◽  
Author(s):  
Dan Chen ◽  
Xiaofang Ma ◽  
Jieyun Liu ◽  
Cong Wang ◽  
Jianqiao Qin
Keyword(s):  
Land Use ◽  
Nitrogen Mineralization ◽  
Organic Nitrogen ◽  
Land Use Conversion ◽  
Mineralization Kinetics ◽  
Short And Long Term

scholarly journals VULNERABILITY ANALYSIS OF UNDERGROUND AQUIFERS TO CONTAMINATION USING THE DRASTIC METHOD AND RISK DETERMINATION

2021 ◽  
Vol 22 (84) ◽  
pp. 227-245
Author(s):  
Berenice de Paula Amaral ◽  
Renato Farias Do Valle junior ◽  
Emerson Ribeiro Machado ◽  
Hygor Evangelista Siqueira
Keyword(s):  
Water Quality ◽  
Environmental Management ◽  
Land Use ◽  
Action Planning ◽  
Industrial Activities ◽  
The World ◽  
Drastic Method ◽  
Short And Long Term ◽  
Sandstone Formation

Groundwater represents an important component in the supply of freshwater in several regions around the world. The contamination of these waters is a worrisome problem in the management of water resources. Since underground aquifers are vulnerable to contamination by human and industrial activities, including land use, the diagnosis associated with land use is critical for environmental management. The present study was carried out in the Uberaba sandstone formation, in which the vulnerability of the subterranean aquifers was determined using the DRASTIC method, by evaluating the interaction between the use and occupation of the land using a geographic information system. Thus, the risk of contamination of the underground aquifer was determined by evaluating the land use with the water quality and fertility. The tool applied in the present study proved effective for the diagnosis, management and action planning in the short and long term, with the intention of preserving these natural resources.

Changes in the nitrogen content and pH of the mobilong clay as influenced by land use

1959 ◽  
Vol 10 (5) ◽  
pp. 637 ◽  
Author(s):  
JS Russell ◽  
DL Harvey
Keyword(s):  
Land Use ◽  
Nitrogen Content ◽  
Organic Nitrogen ◽  
Inverse Relation ◽  
Land Use Pattern ◽  
Nitrogen Levels ◽  
Probable Effect ◽  
Irrigation Drainage ◽  
Made In

The surface horizons of 40 profiles of the Mobilong clay hare been analysed for total nitrogen and pH, and the analyses compared with similar ones made in 1929. Soils which were originally high in nitrogen have declined, those with medium levels hare remained substantially the same, arid those which were originally low have increased in nitrogen content. The Mobilong clay thus appears to be approaching an equilibrium nitrogen content which under the present land use pattern of irrigation, drainage, and management approximates to 0.50 per cent. nitrogen. It seems probable that further declines will occur in the nitrogen content of those soils which are greatly in excess of this value, though at a slower rate than formerly. On the other hand increases in the nitrogen content of those soils with values less than this should occur. The implications of these changes, both in relation to future land use practices and in relation to general concepts regarding the effect of grass-legume pastures on soil nitrogen levels, are discussed. Changes in pH were found to ha essentially in inverse relation to the changes in nitrogen. Thus soils which have decreased in organic nitrogen have increased in pH, and vice versa. The probable effect of flooding and subsequent deposition on long term changes in the Mobilong clay is discussed.

Nitrogen mineralization in forest soil profiles from central Alberta

1987 ◽  
Vol 17 (3) ◽  
pp. 242-249 ◽  
Author(s):  
J. W. Fyles ◽  
W. B. McGill
Keyword(s):  
Nitrogen Mineralization ◽  
Soil Profiles ◽  
Forest Site ◽  
N Availability ◽  
Total N ◽  
Short And Long Term ◽  
Potentially Mineralizable N ◽  
N Fertility ◽  
Time Frames

The nitrogen mineralization characteristics of soils from stands dominated by jack pine (Pinusbanksiana Lamb.) and white spruce (Piceaglauca (Moench) Voss) were examined using a 37-week incubation with periodic leaching to allow measurement of mineralized N. Soils were compared on the basis of total N, N mineralized during the incubation, potentially mineralizable N, mineralization rate constant, and nitrification potential. Nitrogen characteristics of LFH horizons primarily reflected the age and species composition of the existing vegetation while those of A horizons appeared to relate to conditions in previous as well as present stands. Characteristics of B horizons were independent of vegetation implying control by long-term accumulation and transformation of N within the soil. The N fertility of a forest site therefore represents the integration of processes acting within different time frames and an understanding of the relative contributions of short- and long-term processes in the control of N availability is required for efficient fertility management.

scholarly journals Abundance of arthropods as food for meadow bird chicks in response to short- and long-term soil wetting in Dutch dairy grasslands

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7401
Author(s):  
Livia De Felici ◽  
Theunis Piersma ◽  
Ruth A. Howison
Keyword(s):  
Land Use ◽  
Soil Moisture ◽  
Term Treatment ◽  
Small Scale ◽  
Short Term ◽  
Low Intensity ◽  
Local Soil ◽  
Long Term Treatment ◽  
Short And Long Term

Background Throughout the world, intensive dairy farming has resulted in grasslands almost devoid of arthropods and birds. Meadow birds appear to be especially vulnerable during the chick-rearing period. So far, studies have focused mainly on describing population declines, but solutions to effectively stop these trends on the short-term are lacking. In this study at a single farm, we experimentally manipulated soil moisture through occasional irrigation, to mitigate against early season drainage and create favorable conditions for the emergence of above-ground arthropods during the meadow bird chick rearing phase. Methods To guarantee the presence of at least a sizeable arthropod community for the measurement of effects of wetting, we selected a farm with low intensity management. The land use and intensity of the study site and surroundings were categorized according to the national land use database and quantified using remote sensing imagery. From May 1 to June 18, 2017, we compared a control situation, with no water added, to two wetting treatments, a “short-term” (3 weeks) treatment based on wetting on warm days with a sprinkler system and a “long-term” treatment next to a water pond with a consistently raised water table from 2010. We measured soil temperature, soil moisture and resistance as well as the biomass of arthropods at 3-day intervals. Flying arthropods were sampled by sticky traps and crawling arthropods by pitfall traps. Individual arthropods were identified to Order and their length recorded, to assess their relevance to meadow bird chicks. Results The land use analysis confirmed that the selected dairy farm had very low intensity management. This was different from most of the surrounding area (20 km radius), characterized by (very) high intensity land use. The experiments showed that irrigation contributed to cooler soils during midday, and that his happened already in the early part of the season; the differences with the control increased with time. In the short- and long-term treatments, soil moisture increased and soil resistance decreased from the mid-measurement period onward. Compared with the control, cumulative arthropod biomass was higher in the long-term treatment, but showed no change in the irrigation treatment. We conclude that small-scale interventions, such as occasional irrigation, favorably affected local soil properties. However, the effects on above-ground arthropod abundance currently appear limited or overridden by negative landscape-scale processes on arthropods.

Soil bacterial community response to long-term land use conversion in Yellow River Delta

2020 ◽  
Vol 156 ◽  
pp. 103709 ◽  
Author(s):  
Huan He ◽  
Yongjun Miao ◽  
Yandong Gan ◽  
Shaodong Wei ◽  
Shangjin Tan ◽  
...  
Keyword(s):  
Land Use ◽  
Bacterial Community ◽  
Yellow River ◽  
Yellow River Delta ◽  
Community Response ◽  
River Delta ◽  
Soil Bacterial Community ◽  
Land Use Conversion ◽  
Soil Bacterial
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